/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Transforms/TransformGizmoDataBinder.h
Set the vectors that should reflect the gizmo transform. Any of these pointers can be null, but currently the same amount of work is done by the binder (it will simply bind to some internal vectors).
virtual void InitializeBoundVectors ( FVector3d * Translation, FVector3d * RotaionEulerAngles, FVector3d * Scale )